Peter Fairbrother wrote
Yep. N2O (nitrous oxide, or "laughing gas") isn't that great an oxidiser in
rocket applications, although it's by no means useless. Gives lots of gas,
but it's not energetic enough to give really high exhaust temp's. Good for
cars, but not that good for rockets. Afaik no-one has ever used it in a
space rocket.

Just found out: the Russian Vostoks used "N2O/amine" (I'm not quite sure
what "amine" is though) for retro-rockets, with a claimed ISP of 266 s
(vacuum).


--
Peter Fairbrother